package com.kiwilss.dagger.utils.rvutils;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.view.View;

public class Divider2 extends RecyclerView.ItemDecoration
{

    private static final int[] ATTRS = new int[] { android.R.attr.listDivider };
    private Drawable mDivider;

    public Divider2(Context context)
    {
        final TypedArray a = context.obtainStyledAttributes(ATTRS);
        mDivider = a.getDrawable(0);
        a.recycle();
    }

    @Override
    public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state)
    {

        drawHorizontal(c, parent);
        drawVertical(c, parent);

    }

    private int getSpanCount(RecyclerView parent)
    {
        // 列数
        int spanCount = -1;
        RecyclerView.LayoutManager layoutManager = parent.getLayoutManager();
        if (layoutManager instanceof GridLayoutManager)
        {

            spanCount = ((GridLayoutManager) layoutManager).getSpanCount();
        } else if (layoutManager instanceof StaggeredGridLayoutManager)
        {
            spanCount = ((StaggeredGridLayoutManager) layoutManager)
                    .getSpanCount();
        }
        return spanCount;
    }

    public void drawHorizontal(Canvas c, RecyclerView parent)
    {
        int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++)
        {
            final View child = parent.getChildAt(i);
            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
                    .getLayoutParams();
            final int left = child.getLeft() - params.leftMargin;

//            final int right = child.getRight() + params.rightMargin
//                    + mDivider.getIntrinsicWidth();


            final int right = child.getRight() + params.rightMargin
                    + mDivider.getIntrinsicWidth();

            final int top = child.getBottom() + params.bottomMargin;
            final int bottom = top + mDivider.getIntrinsicHeight();
            mDivider.setBounds(left, top, right, bottom);
            mDivider.draw(c);
        }
    }

    public void drawVertical(Canvas c, RecyclerView parent)
    {
        final int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++)
        {
            final View child = parent.getChildAt(i);

            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
                    .getLayoutParams();

            final int top = child.getTop() - params.topMargin;
            final int bottom = child.getBottom() + params.bottomMargin;
            final int left = child.getRight() + params.rightMargin;
            final int right = left + mDivider.getIntrinsicWidth();



            mDivider.setBounds(left, top, right, bottom);
            mDivider.draw(c);
        }
    }

    private boolean isLastColum(RecyclerView parent, int pos, int spanCount,
                                int childCount)
    {
        RecyclerView.LayoutManager layoutManager = parent.getLayoutManager();
        if (layoutManager instanceof GridLayoutManager)
        {
            if ((pos + 1) % spanCount == 0)// 如果是最后一列，则不需要绘制右边
            {
                return true;
            }
        } else if (layoutManager instanceof StaggeredGridLayoutManager)
        {
            int orientation = ((StaggeredGridLayoutManager) layoutManager)
                    .getOrientation();
            if (orientation == StaggeredGridLayoutManager.VERTICAL)
            {
                if ((pos + 1) % spanCount == 0)// 如果是最后一列，则不需要绘制右边
                {
                    return true;
                }
            } else
            {
                childCount = childCount - childCount % spanCount;
                if (pos >= childCount)// 如果是最后一列，则不需要绘制右边
                    return true;
            }
        }
        return false;
    }

    private boolean isLastRaw(RecyclerView parent, int pos, int spanCount,
                              int childCount)
    {


        RecyclerView.LayoutManager layoutManager = parent.getLayoutManager();
        if (layoutManager instanceof GridLayoutManager)
        {
            childCount = childCount - childCount % spanCount;


//            if(childCount % spanCount == 0){
//            childCount=childCount-spanCount;
//        }else{
//            childCount = childCount - childCount % spanCount;
//        }


            if (pos >= childCount)// 如果是最后一行，则不需要绘制底部
                return true;
        } else if (layoutManager instanceof StaggeredGridLayoutManager)
        {
            int orientation = ((StaggeredGridLayoutManager) layoutManager)
                    .getOrientation();
            // StaggeredGridLayoutManager 且纵向滚动
            if (orientation == StaggeredGridLayoutManager.VERTICAL)
            {
                childCount = childCount - childCount % spanCount;
                // 如果是最后一行，则不需要绘制底部
                if (pos >= childCount)
                    return true;
            } else
            // StaggeredGridLayoutManager 且横向滚动
            {
                // 如果是最后一行，则不需要绘制底部
                if ((pos + 1) % spanCount == 0)
                {
                    return true;
                }
            }
        }

//        if(childCount % spanCount == 0){
//            childCount=childCount-spanCount;
//        }else{
//            childCount = childCount - childCount % spanCount;
//        }
//        if (pos >= childCount)// 如果是最后一行，则不需要绘制底部
//            return true;

        return false;
    }


    private boolean isLastRaw2(RecyclerView parent, int pos, int spanCount,
                              int childCount)
    {

        if(childCount % spanCount == 0){
            childCount=childCount-spanCount;
        }else{
            childCount = childCount - childCount % spanCount;
        }
        if (pos >= childCount){
            // 如果是最后一行，则不需要绘制底部
            return true;
        }
        return false;
    }

//    @Override
//    public void getItemOffsets(Rect outRect, int itemPosition,
//                               RecyclerView parent)
//    {
//
////        int left = column * mBuilder.dividerVerSize / spanCount;
////        int right = mBuilder.dividerVerSize - (column + 1) * mBuilder.dividerVerSize / spanCount;
//
//
//
//
//
//        int spanCount = getSpanCount(parent);
//        int childCount = parent.getAdapter().getItemCount();
//
//        int column=itemPosition%spanCount;
//        int right= mDivider.getIntrinsicWidth()-(column+1)*mDivider.getIntrinsicWidth()/spanCount;
//        int left=column*mDivider.getIntrinsicWidth()/spanCount;
//
//        if (isLastRaw(parent, itemPosition, spanCount, childCount))// 如果是最后一行，则不需要绘制底部
//        {
//            outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);
//
//        } else if (isLastColum(parent, itemPosition, spanCount, childCount))// 如果是最后一列，则不需要绘制右边
//        {
//
//            outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());
//        } else
//        {
//            outRect.set(left, 0, right,
//                    mDivider.getIntrinsicHeight());
//            //Log.i("MMM", "getItemOffsets: "+mDivider.getIntrinsicWidth()+"||"+ mDivider.getIntrinsicHeight());
//        }
//    }


    @Override
    public void getItemOffsets(Rect outRect, int itemPosition,
                               RecyclerView parent)
    {


        int spanCount = getSpanCount(parent);
        int childCount = parent.getAdapter().getItemCount();
        int left,top=0,right,bottom;
        int eachWidth = (spanCount - 1) * mDivider.getIntrinsicHeight() / spanCount;
        int dl = mDivider.getIntrinsicHeight() - eachWidth;
        left = itemPosition % spanCount * dl;
        right = eachWidth - left;
        bottom = mDivider.getIntrinsicHeight();
        if (isLastRaw(parent, itemPosition, spanCount, childCount)) {
            bottom = 0;
        }
        outRect.set(left, top, right, bottom);
//        if (isLastRaw(parent, itemPosition, spanCount, childCount))// 如果是最后一行，则不需要绘制底部
//        {
//            outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);
//        } else if (isLastColum(parent, itemPosition, spanCount, childCount))// 如果是最后一列，则不需要绘制右边
//        {
//            outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());
//        } else
//        {
//            outRect.set(0, 0, mDivider.getIntrinsicWidth(),
//                    mDivider.getIntrinsicHeight());
//        }

    }


}
